/**

 * Records

 * https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/record

 * C# 9.0: https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9#record-types

 * C# 10.0: https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-10#record-structs

**/

​

using System;

public class Program

{

    record PersonClass(string Name); // record class

    record struct PersonStruct(string Name); // record class

    readonly record struct PersonStructReadonly(string Name); // record class

    public static void Main()

    {

        Console.WriteLine("-== Records ==-");

        var recordClass = new PersonClass("John"); // OK

        var recordClass2 = new PersonClass("John"); // OK

        /* NOT OK

        var recordClass = new PersonClass

        {

            Name = "John"

        };

        /**/

        //recordClass.Name = "abc"; // NOT OK

        //var recordStruct = new PersonStruct("John"); // OK

        /**/

        var recordStruct = new PersonStruct // OK

        {

            Name = "John"

        };

        var recordStruct2 = new PersonStruct // OK

        {

            Name = "John"

        };

        /**/

        recordStruct.Name = "abc"; // OK

        var recordStructReadonly = new PersonStructReadonly("John"); // OK

        var recordStructReadonly2 = new PersonStructReadonly("John"); // OK

        /*

        var recordStructReadonly = new PersonStructReadonly // OK

        {

            Name = "John"

        };

        /**/

        //recordStructReadonly.Name = "abc"; // NOT OK

        Console.WriteLine($"recordClass: {recordClass}");       

        Console.WriteLine($"recordClass2: {recordClass2}");

        Console.WriteLine($"recordStruct: {recordStruct}");

        Console.WriteLine($"recordStruct2: {recordStruct2}");

        Console.WriteLine($"recordStructReadonly: {recordStructReadonly}");

        // Equality

        Console.WriteLine("\r\n-== Equality ==-");

        Console.WriteLine($"recordClass == recordClass2: {recordClass == recordClass2}");   

        Console.WriteLine($"recordStruct == recordStruct2: {recordStruct == recordStruct2}");   

        Console.WriteLine($"recordStructReadonly == recordStructReadonly2: {recordStructReadonly == recordStructReadonly2}");

    }

}

​

/**

 Results: 

 -== Records ==-

recordClass: PersonClass { Name = John }

recordClass2: PersonClass { Name = John }

recordStruct: PersonStruct { Name = abc }

recordStruct2: PersonStruct { Name = John }

recordStructReadonly: PersonStructReadonly { Name = John }

​

-== Equality ==-

recordClass == recordClass2: True

recordStruct == recordStruct2: False

recordStructReadonly == recordStructReadonly2: True

​

​

**/